Semiconductor chip having bond pads and multi-chip package

ABSTRACT

A semiconductor chip comprises a semiconductor substrate having integrated circuits formed on a cell region and a peripheral circuit region adjacent to each other. A bond pad-wiring pattern is formed on the semiconductor substrate. A pad-rearrangement pattern is electrically connected to the bond pad-wiring pattern. The pad-rearrangement pattern includes a bond pad disposed over at least a part of the cell region. The bond pad-wiring pattern is formed substantially in a center region of the semiconductor substrate. Thus, with the embodiments of the present invention, the overall chip size can thereby be substantially reduced and an MCP can be fabricated without the problems mentioned above.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation of U.S. patent application Ser. No.10/651,813, filed on Aug. 28, 2003, now pending, which is a Divisionalof U.S. patent application Ser. No. 10/192,800, filed on Jul. 9, 2002,now issued U.S. Pat. No. 6,642,627, which claims priority from KoreanPatent Application Nos. 2001-0041154, filed on Jul. 10, 2001 and2002-0003030, filed Jan. 18, 2002, all of which are herein incorporatedby reference in their entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to semiconductor devices and,more particularly, to a semiconductor chip having bond pads and to amulti-chip package (MCP).

2. Description of the Related Art

The industry is expending significant effort toward forming smaller andthinner chips to meet the demand for high packing density in high-speed,multi-functional semiconductor devices. To reduce chip size, the size ofbond pads as well as the pitch between bond pads should be reduced.

Conventional semiconductor chips have either a center pad-type or aperipheral pad-type structure. FIG. 1 is a plan view of a conventionalcenter pad-type semiconductor chip. FIG. 2 is a cross-sectional view ofthe conventional center pad-type chip taken along line 2-2 of FIG. 1.FIG. 3 is a plan view of a conventional peripheral pad-typesemiconductor chip. FIG. 4 is a cross-sectional view of the conventionalperipheral pad-type chip taken along the line 4-4 of FIG. 3.

Referring to FIGS. 1 and 2, a center pad-type semiconductor chip 110comprises a peripheral circuit region A_(peri) for forming bond pads 112and cell regions A_(cell1) and A_(cell2). The peripheral circuit regionA_(peri) is formed in the center region of a semiconductor substrate111. The cell regions A_(cell1) and A_(cell2) are formed on the sides ofthe peripheral circuit region A_(peri).

Referring to FIGS. 3 and 4, a peripheral pad-type semiconductor chip 120comprises peripheral circuit regions A_(peri1) and A_(peri2), and a cellregion A_(cell). The cell region A_(cell) is formed in the center regionof the semiconductor substrate 121. The peripheral circuit regionsA_(peri1) and A_(peri2) are formed on the sides of the cell regionA_(cell). Referring to FIGS. 2 and 4, a passivation layer 113, 123 isformed over the cell regions and the peripheral circuit regions in boththe center and peripheral pad-type chips.

In the conventional semiconductor chips 110, 120 of FIGS. 1 through 4,an additional chip area is needed in peripheral circuit regions forforming bond pads 112, 122. As a result, the ability to reduce the sizeof the conventional semiconductor chips 110 and 120 is limited in bothchip pad types.

Furthermore, it has been difficult to reduce the bond pad size and thepitch between the bond pads 112, 122 in the conventional semiconductorchips 110 and 120. This is because the bond pads 112, 122 must have adesigned minimum size and pitch for electric die sorting (EDS) and toform electrical interconnections.

The ability to reduce the size of a multi-chip package (MCP) includingmultiple conventional semiconductor chips in a single body package isalso limited due to problems such as the difficulty of stacking centerpad-type chips on chips of the same or similar types. That is, wirebonding can be complicated and difficult due to long loop wires in suchcases.

Accordingly, there is a need for a smaller semiconductor chip that caneasily form an MCP without suffering from the problems mentioned above.

SUMMARY OF THE INVENTION

A semiconductor chip comprises a semiconductor substrate havingintegrated circuits formed on a cell region and a peripheral circuitregion adjacent to each other. A bond pad-wiring pattern is formed onthe semiconductor substrate. A pad-rearrangement pattern is electricallyconnected to the bond pad-wiring pattern. The pad-rearrangement patternincludes a bond pad disposed over at least a part of the cell region.According to one embodiment, the bond pad-wiring pattern is formedsubstantially in a center region of the semiconductor substrate.According to another embodiment, a portion of the pad-rearrangementpattern extends substantially from the center region of thesemiconductor substrate toward an edge of the semiconductor substrate.According to yet another embodiment, the bond pad-wiring pattern is formon a portion of the peripheral circuit region and extends across aportion of the cell region.

Thus, with the embodiments of the present invention, the overall chipsize can thereby be substantially reduced and an MCP can be fabricatedwithout the problems mentioned above, thus reducing manufacturing costsand increasing productivity.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other objects, features and advantages of the presentinvention will be more readily understood through the following detaileddescription provided with reference to the accompanying figures, whereinlike reference numerals designate like structural elements, and, inwhich:

FIG. 1 is a plan view of a conventional center pad-type semiconductorchip;

FIG. 2 is a cross-sectional view of the conventional center pad-typetaken along the line 2-2 of FIG. 1;

FIG. 3 is a plan view of a conventional peripheral pad-typesemiconductor chip;

FIG. 4 is a cross-sectional view of the peripheral pad-type chip takenalong the line 4-4 of FIG. 3;

FIGS. 5 to 8 are cross-sectional views of a semiconductor chipillustrating a process of manufacturing a semiconductor chip accordingto an embodiment of the present invention;

FIG. 9 is a plan view of the semiconductor chip shown in FIG. 8;

FIG. 10 is an enlarged cross-sectional view of a semiconductor chipillustrating an alternative configuration of portion A of FIG. 8;

FIG. 11 is a cross-sectional view of the semiconductor chip of FIG. 9,following wire bonding;

FIG. 12 is a cross-sectional view illustrating a semiconductor chipaccording to another embodiment of the present invention;

FIGS. 13 to 15 are cross-sectional views of a semiconductor chipillustrating a process of manufacturing a semiconductor chip accordingto yet another embodiment of the present invention;

FIG. 16 is a cross-sectional view of a semiconductor chip according to afurther embodiment of the present invention; FIG. 17 is across-sectional view of a semiconductor chip according to a stillfurther embodiment of the present invention;

FIG. 18 is a cross-sectional view of an MCP according to anotherembodiment of the present invention;

FIG. 19 is a cross-sectional view of an MCP according to anotherembodiment of the present invention;

FIG. 20 is a cross-sectional view of an MCP according to yet anotherembodiment of the present invention;

FIG. 21 is a cross-sectional view of an MCP according to a furtherembodiment of the present invention;

FIG. 22 is a cross-sectional view of an MCP according to a still furtherembodiment of the present invention; and

FIG. 23 is a cross-sectional view of an MCP according to a still furtherembodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 8 is a cross-sectional view of a semiconductor clip 10 constructedaccording to an embodiment of the present invention. Referring to FIG.8, a semiconductor chip 10 comprises a semiconductor substrate 11 havingintegrated circuits formed thereon. In particular, the semiconductorsubstrate 11 includes a peripheral circuit region A_(peri) formed in thecenter region thereof and cell regions A_(cell1), and A_(cell2) arrangedon the sides of the peripheral circuit region A_(peri). A bondpad-wiring pattern 12 is formed in a predetermined area of the substrate11. The bond pad-wiring pattern 12 can be made of a metal havingexcellent electrical conductivity, such as aluminum (Al).

The bond pad-wiring pattern 12 is preferably formed in a center regionof the semiconductor substrate 11. One end of the bond pad-wiringpattern 12 is preferably formed on the portion of the peripheral circuitregion A_(peri). In the conventional semiconductor chip, an additionalchip area is needed in peripheral circuit regions for forming bond padshaving a minimum size and pitch designed for electric die sorting (EDS)and making electrical interconnections. According to the forgoingembodiment of the present invention, however, no larger additional areafor forming bond pads is required, rather only the small portion of thebond pad-wiring pattern 12 needs to be formed on the peripheral circuitregion A_(peri). The remaining portion of the bond pad-wiring pattern 12extends across a portion of the cell region according to an embodimentof the present invention. The width of the semiconductor substrate 11can therefore be reduced by approximately the width of the bond pad areaof the conventional semiconductor chip.

According to another aspect of the present invention, as shown in FIG.16, the bond pad-wiring pattern 12 can alternatively be formed entirelywithin the peripheral circuit region. Also, the bond pad-wiring pattern12 can be formed entirely within the cell region (although not shown).In these cases, the size of the bond pad-wiring pattern 12 can be madesmall because a designed minimum size and pitch for electric die sorting(EDS) and electrical interconnections is not needed.

Thus, with the embodiments of the present invention, the overall chipsize can thereby be substantially reduced using the above-describedprinciples of the present invention as explained above and furtherbelow.

A passivation layer 16 is formed on the bond pad-wiring pattern 12. Aninterlayer dielectric (ILD) 13 is then formed on the passivation layer16. The ILD 13 is made of a material having good insulation andintegration properties to protect bond pads 17 from mechanical stressdue to subsequent wire bonding, beam lead bonding, or ball bonding. Forexample, a high-density plasma (HDP) oxidized layer, a benzocyclobutene(BCB) layer, a polybenzoxazole (PBO) layer, or a polyimide layer may beused as the ILD 13. An HDP oxide layer using silan, oxygen and argongases, for example, an HDP-SiO₂ layer is preferably used. Thepassivation layer 16 and the ILD 13 have openings 14 formed therein toexpose predetermined portions of the bond pad-wiring pattern 12 a.

A pad-rearrangement pattern 15, having a predetermined layout, is formedon the ILD 13. As shown in portion “A” of FIG. 8, the openings 14 arefilled with the pad-rearrangement pattern 15. An alternativeconfiguration of portion A of FIG. 8 is illustrated in FIG. 10. Thepad-rearrangement pattern 15 preferably comprises three layers. Thesethree layers can, for example, include a titanium (Ti) layer having athickness of about 300 to 500 Å, an aluminum (Al) layer having athickness of about 15,000 Å, and a titanium nitride (TiN) layer having athickness of about 300 to 500 Å. The pad-rearrangement pattern 15 may beformed of copper (Cu), aluminum (Al), zinc (Zn), iron (Fe), platinum(Pt), cobalt (Co), lead (Pb), nickel (Ni), or an alloy of theseelements.

An insulating layer 18 is formed on the pad-rearrangement pattern 15.The insulating layer 18 may be an HDP oxide layer such as an HDP-SiO₂layer or an HDP-SiN layer. The insulating layer 18 may further comprisea polyimide layer on the HDP-SiO₂ layer so as to protect integratedcircuits from alpha particles. A predetermined portion of thepad-rearrangement pattern 15 is exposed through the insulating layer todefine the bond pads 17. The bond pads 17 are preferably flush with thepad-rearrangement pattern 15. The bond pads 17 are disposed above atleast part of the cell regions A_(cell1), A_(cell2) of the substrate 11.Although the bond pads 17 shown in FIG. 9 are disposed in a single rowalong opposing edges of the substrate 11, the pads 17 may be disposedalong all four edges or in a zigzag shape.

According to one embodiment, the pad-rearrangement pattern 15 reroutesthe bond pads 17 from the bond pad-wiring pattern 12 in the peripheralcircuit region A_(peri) to above the cell regions A_(cell1) andA_(cell2). As shown above, one end of the pad-rearrangement pattern 15is electrically connected to the exposed bond pad-wiring pattern 12 viaopenings 14. The other end extends toward the edge of the substrate 11.In other words, according to one aspect of the present invention, theportion of the pad-rearrangement pattern 12 extends substantially fromthe center region of the semiconductor substrate 11 toward an edge ofthe semiconductor substrate 11. The bond pads 17 can therefore be formedalong sides of the semiconductor substrate 11. Thus, according tovarious embodiments of the present invention, peripheral pad typesemiconductor chips can be fabricated using center pad typesemiconductor chips, which are known to have improved electricalperformance characteristics over the peripheral pad type chips. Thepitch between the bond pads can increase. During the EDS test, a probecan easily contact the bond pads. These modified peripheral pad chipsthus need not be packaged in a lead-on-chip (LOC) type package, but maybe implemented in a conventional package.

Referring to FIG. 11, electrical connection means such as bonding wires99 are coupled to the bond pads 17. If necessary, the positions of bondpads 17 can be adjusted depending on the design and structure of theelectrical interconnections.

As described above, the bond pads 17 of this embodiment are preferablyformed over at least a part of the cell regions of the substrate 11.Therefore, the peripheral circuit region A_(peri) has a much smallerwidth than that of the conventional peripheral circuit region. Thus, thetotal width of the semiconductor chip 10 can be reduced. The widths ofthe cell regions A_(cell) ¹ and A_(cell2) may be the same as that of theconventional cell region. Of course, the total thickness of thesemiconductor chip 10 increases due to the formation of thepad-rearrangement pattern 15 and the insulating layer 18 above the cellregions A_(cell1) or A_(cell2). The increased percentage in totalthickness of the chip 10 is no more than the reduced percentage of thetotal width of the chip 10.

The total size of the chip 10 can be therefore reduced.

A method of manufacturing the above-described semiconductor chip 10 willnow be described. Referring to FIG. 5, a semiconductor substrate 11includes on-chip circuits formed on the cell regions A_(cell1),A_(cell2) and the peripheral circuit region A_(peri). If thesemiconductor chip 10 is a memory device, the circuits formed on thecell regions A_(cell1), A_(cell2) are memory cells having MOStransistors and capacitors, while the circuits formed on the peripheralcircuit region include, for example, address decoding circuits and datainput/output buffers for the memory cells. The bond pad-wiring pattern12 is formed on the substrate 11 to be selectively connected to theintegrated circuits. The passivation layer 16 is then formed on the bondpad-wiring pattern 12. The bond pad-wiring pattern 12 is formed in apredetermined layout using conventional techniques such as chemicalvapor deposition (CVD) or physical vapor deposition (PVD) includingsputtering. As described above, although the bond pad-wiring pattern 12can be formed on both the cell regions A_(cell1), A_(cell2) and theperipheral circuit region A_(peri), the bond pad-wiring pattern may beformed just the cell regions A_(cell1), A_(cell2) (not shown).

Next, as shown in FIG. 6, the ILD 13 is formed on the passivation layer16. Openings 14 are formed extending through the passivation layer 16and the ILD 13 to expose predetermined portions of the bond pad-wiringpattern 12. The ILD 13 is made of a material such as HDP-SiO₂ havinggood integration and insulating qualities. The integrated circuits underthe ILD 13 can therefore be protected from physical stresses during theformation of electrical interconnections. The ILD 13 also helpsplanarize the underlying structure. The openings 14 can be formed aboveeither the cell regions A_(cell1), A_(cell2) or the peripheral circuitregion A_(peri).

Although the forgoing embodiment comprises a single ILD, the presentinvention may comprise two or more ILDs, as shown in FIG. 12 and FIG.17. Referring to FIGS. 12 and 17, second ILDs 20 a, 20 can be interposedbetween the ILD 13 and the pad-rearrangement pattern 15. In particular,as illustrated in FIGS. 12 and 17, because the second ILDs 20 a, 20 areinterposed between the ILD 13 and the pad-rearrangement pattern 15, theelectrical properties of the semiconductor chips 30, 90 are improved.The capacitance, for example, can be lowered. The thickness of thesecond ILD 20 a is between 2 to 50 μm, for example determined base onthe capacitance and the intensity supplement. The second ILD 20 a may bemade of benzocyclobutene (BCB), polybenzoxazole (PBO), polyimide, and soon. Also, in this case, the planarization process is preferablyperformed on the ILDs to improve the planarity of the ILDs 13, 20 a or20. Accordingly, the planarity of the pad-rearrangement pattern 15thereon can be in turn improved. Further, connection failures of thebonding wires or the beam leads on the bond pads 17 are prevented andthe adhesion therebetween are improved. The planarization is preferablyaccomplished through chemical and mechanical polishing (CMP).

According to one aspect of the present invention, the ILDs 13 and 20 ofthe semiconductor chip 90 (FIG. 17) distribute mechanical stressesduring the formation of the electrical interconnections and protect thebond pads 17 from the mechanical stresses. In addition, since the bondpads 17 are formed after two planarization processes on the two ILDs,the bonding stability of the wire bonding between the bond pads 17 andthe external device is improved.

Referring to FIG. 7, the pad-rearrangement pattern 15 is formed on theILD 13. The pad-rearrangement pattern 15 fills the openings 14 and iselectrically connected to the bond pad-wiring pattern 12. Thepad-rearrangement pattern 15 is obtained in a desired layout using CVDor sputtering, for example.

Referring to FIG. 8, an insulating layer 18 is formed on thepad-rearrangement pattern 15 and includes an opening 19 to exposepredetermined portions of the pad-rearrangement pattern 15. The exposedportions of the pattern 15 are defined as the bond pads 17. Theinsulating layer 18 is preferably made of HDP-SiO₂ to protect theintegrated circuits from mechanical stresses. The insulating layer 18may further comprise a polyimide layer on the HDP-SiO₂ layer to protectthe integrated circuits from alpha particles. The ILD 20a and theinsulating layer 18 can alternatively made of polyimide.

FIGS. 13 through 15 are cross-sectional views of a semiconductor chipillustrating a process of manufacturing a semiconductor chip inaccordance with another embodiment of the present invention. In thisembodiment, as shown in FIG. 15, a semiconductor chip 50 comprises asecond ILD 20 b on a first ILD 13. Bond pads 17 of this embodiment,however, are formed on the first ILD 13. In order to prevent acushioning effect due to the mechanical stress of the electricalinterconnections, portions of the second ILD 20 b under the bond pads 17are removed.

In particular, Referring to FIGS. 13 through 15, a semiconductorsubstrate 11 includes a bond pad-wiring pattern 12 preferably formed onat least a portion of the peripheral circuit region A_(peri) andelectrically connected thereto. A passivation layer 16 is formed on thesemiconductor substrate 11 and on the bond pad-wiring pattern 12. Thefirst ILD 13 is formed over the semiconductor substrate 11 including thebond pad-wiring pattern 12. A second ILD 20 b is then formed over thefirst ILD 13. A first opening 22 is formed through the first and secondILDs 13, 20 b and the passivation layer 16 to expose a portion of thebond pad-wiring pattern 12. A second opening 24 is formed through thesecond ILD 20 b to expose a portion of the first ILD 13. Apad-rearrangement pattern 15 is formed over the second ILD 20 b andwithin the first opening 22 and is electrically connected to the bondpad-wiring pattern 12. The pad-rearrangement patter 15 is also formedwithin the second opening 24. An insulating layer 18 is formed over thepad-rearrangement pattern 15 and includes an opening 26 therein thatexposes a portion of the pad-rearrangement pattern 15 formed within thesecond opening 24 to define the bond pads 17 over at least a part of thecell region A_(cell). The portions of the pad-rearrangement pattern 15not covered by the insulating layer 18 provide the bond pads 17. Thisembodiment has the similar features as described previously. Forexample, the bond pad-wiring pattern 12 is formed substantially in acenter region of the semiconductor substrate 11.

Various MCPs utilizing the semiconductor chips according to theembodiments of the present invention are obtainable, which will beexplained below. Referring to FIG. 18, an MCP 200 preferably comprises afirst chip 210 a and a second chip 210 b that are vertically stacked ona package substrate 251. A printed circuit board (PCB) or tape wiringsubstrate can be used as the package substrate 251. The substratesurface preferably has a plurality of bonding tips 253 formed thereon.The first and second chips 210 a and 210 b are preferably the same typeof chips. The first and second chips 210 a and 210 b can have structuresformed in accordance with the principles of the present inventiondescribed previously. For example, a bond pad-wiring pattern can beformed substantially in a center region of a semiconductor substrate,for example. Accordingly, the bond pads 217 a and 217 b of the first andsecond chips 210 a and 210 b are formed over cell regions along sides ofthe chips 210 a and 210 b. Thus, the chips 210 a and 210 b can have amodified configuration, i.e., a center pad-type chip can be modifiedinto a peripheral pad-typed chip.

The first and second chips 210 a and 210 b are electrically connected tothe package substrate 251 by electrical connection means such as bondingwires 257, which are in turn electrically connected to the bonding tips253. Thus, each bonding tip 253 is electrically connected to acorresponding one of the bond pads 271 a, 271 b.

The first chip 210 a is mounted on the package substrate 251 with anadhesive 261, and the second chip 210 b is mounted on the first chip 210a with an adhesive material 263. The adhesive material 263 is interposedbetween the first and second chips 210 a and 210 b, thus ensuring enoughspace for the bonding wires 257 used in connecting the first chip 210 awith the package substrate 251.

An encapsulant 259, formed of a material such as an epoxy moldingcompound, protects the upper surface of the package substrate 251 froman external environment by encapsulating the first and second chips 210a, 210 b and the bonding wires 257. Solder balls 271 are formed on thelower surface of the package substrate 251 to provide externalconnection terminals.

As described above, since the MCP 200 according to this embodimentincludes multiple semiconductor chips in a single package body, theprinciples of the present invention can be used to increase memorycapacity as well as the number of input/output pins without complicatedassembly processes.

Referring to FIG. 19, an MCP 300 according to another embodiment of thepresent invention comprises a first chip 310 a and a second chip 31 0bmounted side by side on a package substrate 351. Here, the first andsecond chips 310 a, 310 b preferably have structures the same as orsimilar to the structures described in FIG. 21 or the same as or similarto structures of the chip embodiments described above. For example, thefirst and second chips 310 a, 310 b are preferably electricallyconnected to the substrate 351 by bonding wires 357 through bonding tips353. Reference numerals 359, 361, 371 are used herein to denote anencapsulant, adhesives, and solder balls, respectively.

Referring now to FIG. 20, an MCP 400 according to yet another embodimentof the present invention comprises three semiconductor chips 410 a, 410b, 410 c that are stacked sequentially on a package substrate 451. Thechips 410 a, 410 b, 417 c preferably have structures similar tostructures described previously in accordance with the principles of thepresent invention. For example, the semiconductor chips 410 a, 410 b,410 c are preferably peripheral pad-type chips having realignment bondpads 417 a, 417 b, 417 c formed over cell regions along a periphery (orsides) thereof. The semiconductor chips 410 a, 410 b, 410 c can havedifferent widths from each other. For example, the semiconductor chips410 a, 410 b, 410 c are preferably stacked in order of size, i.e., fromthe largest chip 410 a to the smallest chip 410 c. Differentconfigurations are possible, however, depending on applications. Forexample, any two of the chips 410 a, 410 b, 410 c may have the samewidth.

The semiconductor chips 410 a, 410 b, 410 c are preferably electricallyconnected to the substrate 451 by bonding wires 457 through bonding tips453. As described above, the MCP 400 of this embodiment can comprisedifferent types of chips. Since the center pad-type chip is modifiedinto a peripheral pad-type chip, it is possible to vertically stack themultiple chips and the lengths of the bonding wires can be made shorterto allow easier wire bonding.

Turning to FIG. 21, an MCP 500 according to yet another embodiment ofthis invention is a dual die package (DDP) comprising first and secondsemiconductor chips 510 a, 510 b. A lead frame 551 is used to mount thechips 510 a, 510 b. The second semiconductor chip 510 b is preferablyformed in accordance with the principles of the present inventiondescribed above. For example, the second semiconductor chip 510 b can bea peripheral pad-type chip having a realignment bond pad 517 b formed onthe peripheral circuit region along sides of the chips 510 a, 510 b. Incontrast, the first semiconductor chip 510 a preferably has a centerpad-type bond pad 517 a.

The MCP 500 of this embodiment does not include die pads for mountingthe semiconductor chips 510 a, 510 b. Instead, the leads of thelead-frame 551 employed in the LOC type package are preferably used. Thelength of the leads of the lead frame 551 is preferably longer than thatof the conventional leads, but this is not required. The upper surfaceof the first semiconductor chip 510 a is attached to lower surfaces ofopposing leads of the lead frame 551 by adhesive tape 563. The bond pad517 a of the first chip 510 a is disposed between the opposing leads ofthe lead frame 551 and is wire-bonded to the upper surface of thecorresponding leads of the lead frame 551 by bonding wires 557a. Theupper surface of the second chip 510 b is attached to the lower surfaceof the first chip 510 a with an adhesive 561. The realignment bond pad517 b of the second chip 510 b is wire-bonded to the lower surface ofthe corresponding leads of the lead frame 551 by bonding wires 557 b.The first and second chips 510 a, 510 b and corresponding bonding wires557 a, 557 b are encapsulated by an encapsulant 559.

In summary, the MCP 500 is a DDP comprising semiconductor chips modifiedfrom a center pad-type into a peripheral pad-type or vice versa. Inaddition, with the MCP 500, larger semiconductor chips can be used ascompared to the other embodiments described previously.

Referring to FIG. 22, an MCP 600 according to a still further embodimentof the invention is a DDP comprising first and second semiconductorchips 610 a, 610 b. A die pad 653 and leads 651 are used for mountingthe chips 610 a, 610 b. The first and second chips 610 a, 610 b arepreferably a peripheral pad-type where bond pads 617 a, 617 b are formedalong sides of the chips 610 a, 610 b. The first and second chips 610 a,610 b are attached to the upper and lower surfaces, respectively, of thedie pad 653 with an adhesive 661. The bond pads 617 a of the first chip610 a are wire-bonded to the upper surfaces of the leads 651 by bondingwires 657 a. The bond pads 617 b of the second chip 610 b arewire-bonded to the lower surfaces of the leads 651 by bonding wires 657b. The first and second chips 610 a, 610 b and bonding wires 657 a, 657b are encapsulated by an encapsulant 659.

The MCP 600 of this embodiment comprises chips formed in accordance withthe previously-described principles of the present invention. Forexample, the MCP 600 can comprise semiconductor chips modified from acenter pad-type into a peripheral pad-type.

Referring to FIG. 23, an MCP 700 according to a further embodiment ofthe present invention includes four semiconductor chips 710 a, 710 b,710 c, 710 d. Preferably, a width of a first chip 710 a is substantiallygreater than a width of a second chip 710 b. Also, a width of a thirdchip 710 c is preferably substantially greater than a width of a fourthchip 710 d. The width of the first chip 710 a is also preferablyapproximately equal to the width of the third chip 710 c. A personskilled in the art will appreciate, however, that the widths of thefirst and third chips 710 a, 710 c, or the second and fourth chips 710b, 710 d need not necessarily be equal, but may be made differentdepending on a desired application.

A lead frame 751 having a die pad 753 is used to mount the chips 710 a,710 b, 710 c, 710 d. The non-active surface of the first chip 710 a isattached to the upper surface of the die pad 753. The non-active surfaceof the second chip 710 b is attached to a portion of the active surfaceof the first chip 710 a. The non-active surface of the third chip 710 cis attached to the lower surface of the die pad 753. The non-activesurface of the fourth chip 710 d is attached to a portion of the activesurface of the third chip 710 c. The first and second chips 710 a, 710 bpreferably face upwardly and the third and fourth chips 710 c, 710 dpreferably face downwardly.

The bond pads 717 a, 717 b of the first and second chips 710 a, 710 bare wire-bonded to the upper surface of the lead of the lead frame 751through first and second bonding wires 757 a, 757 b, respectively. Thebond pads 717 c, 717 d of the third and fourth chips 710 c, 710 d arewire-bonded to the lower surface of the lead of the lead frame 751 bythird and fourth bonding wires 757 c, 757 d, respectively. Thesemiconductor chips 710 a, 710 b, 710 c, 710 d and bonding wires 757 a,757 b, 757 c, 757 d are encapsulated with an encapsulant 753. Herein,the reference numerals 761, 762, 763, and 764 each represent anadhesive.

In various embodiments of the present invention, such as those describedpreviously, electrical connections between the chips and the lead frameor package substrate are preferably made by wire bonding. Othertechniques may be used instead, however, to form an MCP according to thepresent invention.

Also, a person skilled in the art will appreciate that other types oflead frames or tape can be used different from the lead framesillustrated in the accompanying figures. For example, the lead frameshave inner leads bent twice and outer leads are J-leaded. In this case,the bent portion of the inner leads overlies on the active surface ofone of plural chips and attached thereto by an adhesive tape or othersuitable adhesives.

Although the MCPs of the various preferred embodiments of the presentinvention are illustrated as including between two and foursemiconductor chips in a single MCP body, other numbers of chips can beincorporated in an MCP depending on the desired application.

The chips can be all the same type of chip, such as memory chips, forexample. As another example, one of the chips can be a DRAM and theother can a flash memory. Alternatively, the chips can be of differenttypes. For example, one of the chips can be a memory chip such as aflash memory, a static random access memory (SRAM), or a dynamic randomaccess memory (DRAM), and another chip can be a non-memory chip such asa microprocessor. The present invention can therefore be used toimplement a system in a package (SIP) and thereby significantly increasepacking density.

Although various preferred embodiments of the present invention havebeen disclosed herein for illustrative purposes, those skilled in theart will appreciate that various modifications, additions, andsubstitutions are possible without departing from the scope and spiritof the invention as provided in the accompanying claims.

1. A semiconductor chip comprising: a semiconductor substrate havingintegrated circuits formed on a cell region and a peripheral circuitregion adjacent to each other; a bond pad-wiring pattern formed on thesemiconductor substrate; and a pad-rearrangement pattern electricallyconnected to the bond pad-wiring pattern, the pad-rearrangement patternincluding a bond pad disposed over at least a part of the cell region.2. The semiconductor chip of claim 1, wherein the bond pad-wiringpattern is formed on at least a part of the peripheral circuit region.3. The semiconductor chip of claim 2, wherein the bond pad-wiringpattern is disposed on the outer edge of a surface of the semiconductorchip.
 4. The semiconductor chip of claim 1, wherein the bond pad-wiringpattern is formed on at least a part of the cell region.